Before you start to balance the carbs, check the valves. The
compression test really doesn't tell you whether the valve lash is set
correctly, and if that's off, you'll go crazy trying to get the carbs
balanced.
Chris Kotting
ckotting@iwaynet.net
William M Walters wrote:
>
> I recently began helping (???) my nephew work on a '73 1275 engine. It
> runs, but not very well. I have some experience with the SU carbs and
> equalizing them with a Unisyn. My problem is that I can't seem to get
> the rear carb to have any vacuum unless the idle screw is cranked down to
> about 3500 rpm. The front carb has good vacuum at all rpm's.
> I have run compression tests, and all cylinders are around 140-150
> pounds. A vacuum gauge hooked to the intake manifold at the vacuum
> advance nipple shows good draw, but it bounces around a lot. Are the two
> things connected? The PO said he put a carb kit in so I'm a little
> concerned as to whether he might have done something wrong.
> Any help you can give will be appreciated.
> Bill
> Former Bugeye owner
> http://dl.www.juno.com/get/tagj.
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